Abstract: In this paper, the mechanism and the phenomena of the anchor-soil interaction were studied, and the soil dilatancy was regard as the main factor contributing to the increase of the anchor soil interface. The anchor-soil interface mode1s have been developed for hardening and softening behav ior, with which one can predict the anchor pertbrmance for the given interface parameters, and to determine the interface parameters from the given anchor pull-out test respectively This may reduce a lot of anchor pull-ou...